Remove Lines Containing A Certain Word – Online Line Filter & Grep Tool
Instantly remove or extract lines containing specific words, multiple keywords, or regular expression patterns in real time. Perfect for filtering server logs, cleaning email and URL lists, stripping commented lines from code, or running browser-based grep searches without command-line setup.
How to Remove or Filter Lines by Keyword
- Paste Your Multi-Line Text – Enter your log file, CSV rows, URL list, or document into the Source Text box, or click Load Sample to try an example log file.
- Enter One or Multiple Search Terms – Type a single keyword in Word or phrase to match, or paste a list of unwanted terms in Multiple words / phrases (one per line).
- Select Match Position & Options – Choose whether the keyword can appear anywhere in the line, at the start of the line, at the end of the line, or must match the entire line. Enable Keep matching lines if you want to extract matching rows instead of deleting them.
- Copy or Export – Your filtered output and line statistics update live. Click Copy to Clipboard or Download .txt to save your result.
Exemplos de antes e depois
1. Remove Noise From Server Logs
Multiple words: [DEBUG], [INFO]
[INFO] Server started on port 8080 [DEBUG] Connection pool initialized [ERROR] Database timeout after 30s [INFO] Healthcheck passed
Filtered Result:
[ERROR] Database timeout after 30s
2. Extract Matching Lines (Grep Mode)
Search: @company.com + Keep matching lines
alice@company.com bob@gmail.com carol@company.com dave@yahoo.com
Filtered Result:
alice@company.com carol@company.com
3. Strip Comments & Blank Lines
Regex: ^\s*(#|//|--) + uncheck Preserve empty
# Database Configuration db_host = localhost // Port setting db_port = 5432
Filtered Result:
db_host = localhost db_port = 5432
Cheat Sheet: Common Line Filtering & Regex Recipes
Combine Match Position, Invert Match, and Regular Expressions to perform powerful command-line grep and sed tasks right in your browser:
| Task / Goal | Search Pattern | Configurações recomendadas |
|---|---|---|
| Remove all blank or whitespace-only lines | (deixe em branco) | Uncheck Preserve empty lines |
| Remove comment lines in config/code files | ^\s*(#|//|--|;) |
Check Use regular expression (Regex) |
| Keep only lines containing a valid URL | https?:// |
Check Use Regex + Keep matching lines |
| Remove lines starting with a specific word | deprecated |
Select Line starts with pattern |
| Remove lines ending with a specific domain/extension | .tmp |
Select Line ends with pattern |
| Remove lines containing numbers | \d+ |
Check Use regular expression (Regex) |
When to Use "Remove Lines" vs. "Find and Replace" or "Remove Prefix/Suffix"
- Use Remove Lines Containing A Word (this tool) when you want to delete or extract the entire line whenever a keyword or pattern appears on that line.
- Use Remove Prefix or Remove Suffix when you want to keep the line itself and only trim characters from the beginning or end of the line.
- Use Find and Replace Text when you want to delete only the matched word inside the line while leaving the rest of the sentence intact.
Perguntas frequentes
How do I remove lines containing any of multiple words at the same time?
Type or paste your list of words into the Multiple words / phrases (one per line) box under Filter Keywords. Any line that matches at least one of the listed items will be removed (or kept if you enable Keep matching lines).
How does "Match whole words only" handle tags like [ERROR] or #todo?
With Match whole words only enabled, searching for cat will match my cat without accidentally matching category or scatter. Unlike basic tools whose \b regex boundaries fail on punctuation, our tool uses smart alphanumeric boundaries so whole-word matching also works on symbol-wrapped terms like [ERROR], #todo, and @gmail.com.
How can I extract only the lines that match my keyword?
Enable Keep matching lines (remove non-matching) under Filter Behavior. This works just like grep on Linux/macOS, discarding all non-matching lines and leaving only the lines that contain your search pattern.
Is my log or list data uploaded to any server?
No. All line filtering and regex matching run 100% locally in your browser via JavaScript. Your logs, emails, and lists never leave your computer.